When a ship crashes outside of Cardiff, UNIT and Torchwood join forces again, but they're facing more then they realize. Two alien races with differing agendas -- which one can they trust? With the fate of the Earth in the balance, that's one question they'll need to answer before it's too late.
Jack and Ianto try again to have their date, but they are interrupted by a distress call from an alien spacecraft. When the dust settles, Ianto has a new perspective on his work, the planet, and Jack.